Polymer for CEOR: a key technology for enhanced oil recovery

introduction

Polymer flooding technology, as one of the core means of Chemical Enhanced Oil Recovery (CEOR), plays an irreplaceable role in the continuous high and stable production of China's petroleum industry. With the development of conventional oil fields entering the middle and late stages, polymer flooding technology has become an important technical measure for efficient oil flooding through its unique dual action mechanism - enlarging the swept volume on the macro level and improving the washing efficiency on the micro level.

Principle and advantage of polymer flooding technology

Polymer flooding polymers have a range of excellent properties:

●Excellent solubility: good water solubility, can form a uniform displacement system

●Excellent injectivity: suitable for different permeability formations

●Excellent stability: shear resistance, high salinity resistance, salt resistance

●Long-lasting effectiveness: Good chemical and biological stability

These characteristics enable the polymer flooding agent to effectively increase the aqueous phase viscosity, reduce the oil flow ratio, and significantly improve the sweep efficiency. At the same time, the polymer is selective to oil and water, and can preferentially enter the high aquifer. By adjusting the water absorption profile in the formation and blocking the large outlet, the dual effect of "water blocking and oil increasing" can be achieved.

Serialized product solutions

For different reservoir characteristics and development needs, our company has developed a complete range of polymer products for oil displacement:

1.Polymer displacement agent

Oil displacement polymers specifically designed for conventional reservoirs with:

●Precise molecular weight control to match different permeability reservoirs

●Optimized stickiness ensures good mobility control

●Enhanced anti-aging performance to maintain long-term oil displacement effect

2.Oilfield profile control and water blocking agent

Depth profile control system for heterogeneous reservoir development:

●Intelligent and responsive materials selectively block hyperpermeability channels

●Controllable forming time to meet the needs of different well depths

●Lasting sealing effect, effectively improve the suction profile

3.Polymer microspheres

Nanometer/micron functional materials especially suitable for low permeability reservoirs:

●Precise dimensional design to achieve deep fluid flow direction

●Adaptive expansion characteristics to match different throat apertures

●Excellent injection performance to avoid near well clogging

Application effect and prospect

Field applications show that the polymer series for oil displacement can:

●Increase oil recovery by 8-20 percent

●Effectively control the rise rate of water cut

●Extend the economic production life of the oil field

As the development of unconventional oil and gas resources increases and conventional oil fields enter the period of high water cut, polymer technology for oil displacement will continue to innovate, develop in the direction of more efficient, more environmentally friendly and more intelligent, and provide solid technical support for China's energy security.

In the future, we will continue to optimize the performance of existing products, develop new functional polymer systems, and promote the greater role of polymer technology for oil displacement in the field of enhanced oil recovery.